Wheel center



FIG. 1 is a front-elevational view of a wheel center, showing my new design;

FIG. 2 is a rear-elevational view thereof;

FIG. 3 is a side-elevational view thereof;

FIG. 4 is a cross-sectional view taken along line 4--4 of FIG. 1;

FIG. 5 is a cross sectional view thereof taken along line 5--5 of FIG. 1. 

The ornamental design for a wheel center, as shown and described. 